camera: Handle the num-jpegs-per-shutter mode

 * M7 will set this value to 1, but set the number of burst shots to 3.
 * We need to call takePicture on the hardware a number of times before
   accepting the jpeg.

Change-Id: I169ee3139e8643a39133d7385afe2f88982a1612
Merge remote-tracking branch 'cm/cm-11.0' into cm-11.0